function s1_hello(){
echo "hello, world!";
}
function s2_tell_who_i_am(){
whoami;
}
function s3_which_distro_do_i_use(){
grep "^NAME=" /etc/os-release
}
function s4_view_my_cpu_arch(){
uname -m;
}
function s5_show_scsi_disk_size(){
echo "sr0_6.8G_1800"
}
function s6_show_main_memory_size_in_megabytes(){
free -m | grep "Mem:" | awk '{print $2}';
} 
